/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tuandai.commons.encrypt;


import java.util.Map;

/**
 * A {@link TextEncryptorLocator} that pulls RSA key pairs out of a keystore. The input
 * map can contain entries for "key" or "secret" or both, or neither. The secret in the
 * input map is not, in general, the secret in the keystore, but is dereferenced through a
 * {@link SecretLocator} (so for example you can keep a table of encrypted secrets and
 * update it separately to the keystore).
 *
 * @author Dave Syer
 *
 */
public class KeyStoreTextEncryptorLocator {

    private final static String KEY = "key";

    private final static String SECRET = "secret";

    private KeyStoreKeyFactory keys;

    private String defaultSecret;

    private String defaultAlias;

    private PassthruSecretLocator secretLocator = new PassthruSecretLocator();

    private RsaAlgorithm rsaAlgorithm = RsaAlgorithm.DEFAULT;
    private boolean strong = false;
    private String salt = "deadbeef";

    public KeyStoreTextEncryptorLocator(KeyStoreKeyFactory keys, String defaultSecret,
                                        String defaultAlias) {
        this.keys = keys;
        this.defaultAlias = defaultAlias;
        this.defaultSecret = defaultSecret;
    }

    /**
     * @param secretLocator the secretLocator to set
     */
    public void setSecretLocator(PassthruSecretLocator secretLocator) {
        this.secretLocator = secretLocator;
    }

    public void setRsaAlgorithm(RsaAlgorithm rsaAlgorithm) {
        this.rsaAlgorithm = rsaAlgorithm;
    }

    public void setStrong(boolean strong) {
        this.strong = strong;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    public RsaSecretEncryptor locate(Map<String, String> keys) {
        String alias = keys.containsKey(KEY) ? keys.get(KEY) : this.defaultAlias;
        String secret = keys.containsKey(SECRET) ? keys.get(SECRET) : this.defaultSecret;
        return new RsaSecretEncryptor(this.keys.getKeyPair(alias,
                this.secretLocator.locate(secret)), this.rsaAlgorithm, this.salt, this.strong);
    }

}
